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doc/go1.22: document changes to vet loopclosure analyzer

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cmd/vet no longer reports loopclosure bugs within files built at
GoVersion>=1.22.

For #61422.

Change-Id: I6f29373bb236822ece4e7ae35914859538b8d57b
Reviewed-on: https://go-review.googlesource.com/c/go/+/551376
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
Run-TryBot: Tim King <taking@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
This commit is contained in:
Tim King 2023-12-19 10:08:00 -08:00
parent a2a2c5b947
commit adec22b9f7
1 changed files with 14 additions and 3 deletions
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17
doc/go1.22.html
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@ -136,9 +136,20 @@ packages that do not have their own test files. Prior to Go 1.22 a
<h3 id="vet">Vet</h3>
<!-- <p><\!-- CL 539016 -\-> -->
<!-- TODO: <a href="https://go.dev/cl/539016">https://go.dev/cl/539016</a>: go/analysis/passes/loopclosure: disable checker after go1.22.; loopclosure was modified to only not report in files with GoVersion after 1.22. -->
<!-- </p> -->
<h4 id="vet-loopclosure">References to loop variables</h4>
<p><!-- CL 539016, https://go.dev/issue/63888: cmd/vet: do not report variable capture for loop variables with the new lifetime rules -->
The behavior of the <code>vet</code> tool has changed to match
the new semantics (see above) of loop variables in Go 1.22.
When analyzing a file that requires Go 1.22 or newer
(due to its go.mod file or a per-file build constraint),
<code>vet</code>code> no longer reports references to
loop variables from within a function literal that
might outlive the iteration of the loop.
In Go 1.22, loop variables are created anew for each iteration,
so such references are no longer at risk of using a variable
after it has been updated by the loop.
</p>
<h4 id="vet-appends">New warnings for missing values after append</h4>